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authorHampusM <hampus@hampusmat.com>2024-08-27 20:41:15 +0200
committerHampusM <hampus@hampusmat.com>2024-08-27 21:03:06 +0200
commit3248590d18018dcb38afb4af0741c030bf3f8cd3 (patch)
tree65326bc09e7dff78d3531a4f83ad28e43ce49e81 /src
parent43b5892cf99c29ce75a365ae001b3ec6dd6cb688 (diff)
feat: add function to get slice with fields of all items
Diffstat (limited to 'src')
-rw-r--r--src/lib.rs45
1 files changed, 45 insertions, 0 deletions
diff --git a/src/lib.rs b/src/lib.rs
index e55d8ec..943ad04 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -116,6 +116,8 @@ where
}
/// Returns a field of the item with the given index.
+ ///
+ /// This function is equivalant to doing `.get_all().get(index)`
pub fn get<FieldSel>(
&self,
index: usize,
@@ -138,6 +140,18 @@ where
Some(unsafe { field_ptr.cast().as_ref() })
}
+ /// Returns a slice containing the specified field of all items.
+ pub fn get_all<FieldSel>(&self) -> &[<FieldSel as ItemFieldSelection<ItemT>>::Field]
+ where
+ FieldSel: ItemFieldSelection<ItemT>,
+ {
+ let field_arr_byte_offset = self.field_arr_byte_offsets[FieldSel::INDEX];
+
+ let field_arr_ptr = unsafe { self.ptr.byte_add(field_arr_byte_offset) };
+
+ unsafe { std::slice::from_raw_parts(field_arr_ptr.as_ptr().cast(), self.len()) }
+ }
+
/// Returns the number of items stored in this `MultiVec`.
pub fn len(&self) -> usize
{
@@ -707,4 +721,35 @@ mod tests
[9090, 2233, u16::MAX - 75, 8182]
);
}
+
+ #[test]
+ fn get_all_works()
+ {
+ let mut multi_vec = MultiVec::<Foo>::new();
+
+ #[repr(packed)]
+ #[allow(dead_code)]
+ struct Data
+ {
+ num_a: [u32; 3],
+ num_b: [u16; 3],
+ }
+
+ let data = Data {
+ num_a: [u32::MAX - 3000, 901, 5560000],
+ num_b: [20210, 7120, 1010],
+ };
+
+ multi_vec.ptr = NonNull::from(&data).cast();
+ multi_vec.field_arr_byte_offsets = vec![0, size_of::<u32>() * 3];
+ multi_vec.length = 3;
+ multi_vec.capacity = 3;
+
+ assert_eq!(
+ multi_vec.get_all::<FooFieldNumA>(),
+ [u32::MAX - 3000, 901, 5560000]
+ );
+
+ assert_eq!(multi_vec.get_all::<FooFieldNumB>(), [20210, 7120, 1010]);
+ }
}